Adding a Fallback Field When Attribute Variants Aren't Found [dfrpswc][datafeedr]

mycode_import_color_attribute-3.php

<?php

/**
 * Add the product's color as an attribute.
 *
 * The attribute 'Color' with a slug of 'color' must already exist here: WordPress Admin Area > Products > Attributes
 *
 * @param array|string $value The current value of the $attribute for this $post.
 * @param string $attribute The slug of the attribute. Examples: pa_color or pa_shoe-size
 * @param array $post An array of post data including ID, post_title, post_status, etc...
 * @param array $product An array of product data returned from the Datafeedr API.
 * @param array $set A post array for this Product Set with an array key of postmeta containing all post meta data.
 * @param string $action The action the Product Set is performing. Value are either 'insert' or 'update'.
 *
 * @return array|string The updated attribute's value.
 */
add_filter( 'dfrpswc_filter_attribute_value', function ( $value, $attribute, $post, $product, $set, $action ) {

	$ai = new Dfrpswc_Attribute_Importer( 'color', $value, $attribute, $product );

	$ai->add_field( [ 'color' ], 'color' );

	$ai->add_term( 'Black', [ 'ebony', 'onyx', 'obsidian' ] );
	$ai->add_term( 'Blue', [ 'navy', 'indigo', 'azure', 'periwinkle', 'lavender', 'cobalt' ] );
	$ai->add_term( 'Brown', [ 'caramel' ] );
	$ai->add_term( 'Green', [ 'lime', 'moss', 'mint', 'pine', 'chartreuse', 'sage', 'olive' ] );
	$ai->add_term( 'Grey', [ 'gray', 'silver', 'charcoal' ] );
	$ai->add_term( 'Pink', [ 'rose', 'fuchsia', 'rouge', 'salmon', 'coral', 'magenta' ] );
	$ai->add_term( 'Purple', [ 'mauve', 'violet', 'lavender', 'beetroot', 'burgundy', 'mulberry' ] );
	$ai->add_term( 'Red', [ 'cherry', 'rose', 'ruby', 'crimson', 'scarlet', 'garnet' ] );
	$ai->add_term( 'Tan', [ 'beige', 'camel', 'khaki' ] );
	$ai->add_term( 'White', [ 'pearl', 'alabaster', 'ivory', 'cream', 'egg shell', 'eggshell' ] );
	$ai->add_term( 'Yellow', [ 'lemon' ] );

	return $ai->result();

}, 20, 6 );